Laser Brazing Research on Carbon Steel and Stainless Steel Applying Fe-Based Amorphous Coating

The Fe-based amorphous ribbons were prepared by the copper roller melt spinning method, and then the laser brazing was carried out using the amorphous ribbons as the brazing filler metal. Subsequently, laser was used to melt and brazed the plain steel and stainless steel whose surfaces had been pre-coated with the Fe-based amorphous brazing. The micro Vickers hardness tester, metallographic microscope, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the hardness, morphology, microstructure and composition distribution of the welded joints, respectively. The results showed that the prepared amorphous ribbons were of fully amorphous structure. The ordinary steel and stainless steel were well-connected, and mutual dissolution and diffusion had occurred between the solder and the base metal, which achieved the metallurgical bonding. The Fe-based amorphous ribbons were used to solder heterogeneous sheet metals that were difficult to be welded directly. New attempts were made in the hard-connected metal plate field, and the paper could provide concrete references for soldering metals with low invasion, which is of great significance in promoting the development and application of amorphous brazing.